| 激光三维成像中双光楔扫描参数的确定及优化 |
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| 引用本文： | 李硕丰,徐文东,赵成强.激光三维成像中双光楔扫描参数的确定及优化[J].红外与激光工程,2020,49(8):20190508-1-20190508-7. |
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| 作者姓名： | 李硕丰 徐文东 赵成强 |
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| 作者单位： | 1.中国科学院上海光学精密机械研究所 强场激光物理国家重点实验室，上海 201800 |
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| 摘 要： | 在激光三维成像雷达中，双光楔扫描是一种常用的扫描方式，具有能耗小、精度高、抗震性好等优点，并可有效减小系统的体积。但其扫描轨迹复杂，扫描点存在较大的冗余。首先基于一级近似公式研究了扫描轨迹的规律，随后分析了扫描轨迹间距和扫描点间距的变化特征，最终确定了全视场覆盖时的双光楔扫描参数，并由轨迹分布特征给出了降低冗余的方案。结果表明，全视场覆盖时，反向旋转和同向旋转具有相同的最小冗余2π，除旋转方向外，其他扫描参数完全相同。有效扫描视场和分辨率一定时，特定转速对下，部分覆盖的反向旋转可减小1/4的冗余；半周期的同向旋转可减小1/2的冗余。冗余降低的同时提升了成像的帧频。
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| 关 键 词： | 激光扫描系统 双光楔 冗余度 图像分析 |
| 收稿时间： | 2019-12-07 |
Determination and optimization of Risley prisms scanning parameters in laser 3D imaging |
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| Affiliation: | 1.State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Risley prisms in laser 3D imaging radar can effectively reduce the size and weight of the system, which have the advantages of low energy consumption, high precision, and vibration insensitivity. However, the scanning trajectory is complicated, and there is a large amount of redundancy in the scanning points. Firstly, the distribution law of scanning trajectories was studied based on the first-order approximation formula. The variation characteristics of the distance between the scanning trajectories and the distance between the discrete scanning points were then analyzed. Finally, the system scanning parameters for full field of view coverage were obtained. The results show that when full field of view is covered, the counter-rotation and co-rotation have the same system scanning parameters and both have the same minimum redundancy 2π and identical scanning parameters except for the direction of rotation. When the effective scanning field of view and resolution are fixed, at specific speed pair, the partial coverage of the counter-rotation can reduce 1/4 of the redundancy and half-period co-rotation can reduce half of the redundancy. The reduction of redundancy means that the imaging frame rate is increased. |
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